Dear Mr. Campbell,
Thank you for posting your request on History Hub!
We suggest that you contact the New York State Library and the New York State Archives to request a search of their colonial and early state records such as tax lists, land patents, church records, and court papers for information about your Delaware County ancestor. Also, please review the FamilySearch Research wikis for Delaware County, New York Genealogy and New York Colonial Records.
We hope this is helpful. Best of luck with your family research!